406 Energy hero

In 1941 Ted Williams was batting .400 going into the final day of the season. His Coach asked if he wanted to sit out to preserve history and Williams responded:

"If I'm going to be a .400 hitter, I want more than my toenails on the line."

He played the double header, went 6 for 8, and finished the season with a .406 batting average.

This is the standard behind our name. At 406 Energy, commitment, confidence, and the pursuit of excellence are fundamental to our identity.

Focused on Development

406 Energy's leadership formed part of the technical team at XCL, bringing proven expertise in identifying and developing high-return oil & gas assets. Founded to capitalize on undervalued opportunities with top-tier upside, our mission is to deliver strong production growth, operational efficiency, and long-term value for stakeholders.

Our Team

Josh Sigler

Founding Partner - CDO

Mark Graeve

Founding Partner - CEO

Tom Kastens

Founding Partner - COO

Eric Matus

Founding Partner - CTO

Our Partner

406 Energy is backed by NGP Energy Capital. For more than three decades, NGP has played a leading role in shaping the North American energy landscape, continually looking ahead with a focus on innovation. At heart, they combine investment expertise with business building. Their portfolio has fueled entrepreneurial growth, spurred technological progress, created opportunities for workers, strengthened U.S. energy independence, and advanced the goals of their partners. Today, NGP stands among the most respected private equity firms in the energy sector.